Automatic engraving-machine.



No. 761,350. PATBNTBD MAY-s1, 1904; M. BARR.

AUTOMATIC ENGRAVING' MACHINE.

n APPLICATION FILED JULY 11, 1901.

N0 MODEL. .2 SHEETS-SHEET 1.

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PATBNTED MAY 31, 1904. MBARR. AUTOMATIC ENGRAVING' MACHINE.

2 SHEETS-SHEET 2.

No MODEL'.

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PATENT QFFICE.

MARK BARR, or xENsINeTON, ENGLAND, AssieNoR To THE LINOTYPE COMPANY, LIMTTED, OF LONDON, ENGLAND.

AUTOMATIC ENGRAVING-MACHINE.

SPECIFICATION forming part of Letters PatentNo. l761,350, dated May 31, 1904.

serial No. 67,935. (Nd modem' f Application filed July 11, 1901.

To all whom, it may concern.:

Be it known that I, MARK BARR, residing at Kensington Court Gardens, Kensington, in the county of Middlesex, England, have invented certain new and useful Improvements in Automatic Engraving-Machines .and I do hereby declare the following to be a full, clear,

, and exact description of the invention, such as quired speed.

will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to improve- Vments in that class of automatic engravingl machines the distinctive feature of which is a single straight rotating shaft one end of which carries the pattern and the other end the work and which shaft has combinedwith it a linkage carrying the tracer and the tool and communicating the motions of the former homologously to the latter; means for adjusting the position of the linkage for ratio ofreductionl between the pattern and the work; means for traversing thetracer and the tool radially over the pattern and the work, respectively; means for alining the tracer and the tool axially with the shaft, and means for the adjustment of the tracer and the tool `in the direction of their respective axes.

The4 class of machine above described is specified in a pending application, Serial No.v 53,911, flledApril 1, 1901; and the presentinvention consists in an improved linkage.;``

Referring to the -accompanying draw-ings, which are to be taken as part of this specification and read therewith, Figure 1 is a plan;

Fig. 2, a side elevation thereof from the left hand, and Fig. 3 afront elevation of thev same figure.

1 is the single straight shaft vabove mentioned. 2 2 are its bearingscarried by the base 14 and in which it can bey rotated at the re- 3 is its driving-pulley. Means for drivingthe latter are not included in the drawings, because they 4do not constitute any part of the present invention and are besides well known. Any motor that can quickly be reversed may be used. The position of the shaft 1 in the bearings 2 2 must be capable of longitudinal adjustment and incapable of longitudinal 'motion in. its adjusted position for Figs. land a reason explained farther on. To this end the shaft carries its pulley 3 between the two bearings 2 2, the'pulley being held to the shaft l by a set-screw65, passed through the pulleyboss 66.

4; is the pattern-block.- It is mounted fast upon and 'to the respective end of the shaft 1 y by any suitable means, having that face of it which 'carries the pattern (represented in by the dotted line 5) outward, as shown.

7 is the work-block. Itis likewise mounted `fast upon and' to 'therespective end of the shaft 1 by any suitable means, having the face l 1 capable ofsliding through a sleeve 69, adapted` to turn on the base 14 about a vertical axis,

l this axis being the fulcrum of the said lever 68, a lever 10 ofthe first classfturning on a vertical fulcrum 16 on'the lever 68, the fulcrum 16 intersectingv the lever 68, a lever 11 of the second class turning on a vertical fulcrurn 18in the front endof the lever 68, the

said lever 11 beingthe same length as that of the lever 1'0 rearward of the fulcrum 16, and

va link connecting the rear ends of the le- :vers 10 and 11 and holding them constantly parallel with' each other.

lThe above-mentioned vertical axis is shown The fulcrum 16 is shown as conveniently provided by 'a 'pair of studs .8O 80,: projecting from al ring 81, fast on the lever 68'and entering holes in the top and bottom of the loop 82 in the -lever 10, the latter being lcranked to hold the loop at the necessary level and the fulcrum 18 by a pin 18, passed' through the forked end 77 and the lever 68, tlie'end 77 embracing the lever 68 for the purpbse 15 is the tracer.. It is carried intlie front :end of the lever 10, the axis ofthe tracer being at right angles with the length of the said lever.

17 is the tool. at the same angle with it as that of the tracer 15 with its lever 10.

79 is a spring pulling from the lever 68 on the lever to keep both the tracer 15 and tool 17 in contact with the `pattern 5 and the work 8, respectively.

The tracer 15 is moved radially to and fro over the pattern 5 and the tool 17 over the work 8 homologously with each other by rocking the lever 68 on its fulcrum. This is effected by a rod 67, adapted to slide in a bore 70 in the lever 68, a slide 7 1 having the rear end of the rod 67 pivoted upon it by a vertical pivot 72 and capable of being traversed forward and backward in adirection at right angles with the shaft 1 in a guide 7 3, fast on the base 14, by the engagement in a screwthreaded nut 74, fast on the said slide 71, of a traversing-screw 75, turning without longitudinal motion ina stationary bracket 76. The screw 75 is turned by any suitable reversible motor driving onto the pulley 78. The action of the screw 75 in moving vthe tracer 15 over the pattern 5 and the tool 17 over the work 8 will be understood from a comparison of the full lines with the dotted lines of the linkage in Fig. 1. It is indifferent whether the tracer 15 starts at the center of the pattern 5, traveling outward to the circumference, or vice versa.

The dimensional proportions between the pattern 5 and the work 8 are as those between the respective distances of the fulcra 16 and 18 from the axis of the shaft 1. For adjusting these distances or, in other words, for adljusting the ratio of reduction' between the pattern 5 and the work 8 when that ratio is greater than the minimum ratio of which the machine is capable the lever 68 must be moved byhand to the front through the sleeve 69.

25 is a scale on the lever 68, having its zero at the front end of it and the rear end of the sleeve 69 serving as the index for it. The unit of this scale is equal to the minimum distance between the axis of the shaft 1 and the fulcrum 18, while the scale itself is one of additions to be made to the distance of the axis of the shaft 1 from the fulcrum 18 and of corresponding subtractions to be made from the distance of the said axis from the fulcrum .16 in setting the lever 68 in the sleeve 69.

The zero position of the said lever 68 in its sleeve 69 is always coincident with the maximum ratio between pattern and work. Let a equal the angle of the lever 11 with the lever 68 when the axis of the tracer 15, the tool 17, and the shaft 1 are alined with each other. d equals the radius of the work 8, P equals the radius of thepattern 5, S equals the distance in a direction perpendicular to the vertical plane vwhich contains the axis of the sha1' t 1, through whichl a given point on the It is carried by the lever 11- axes of the lever 68 moves when any adjustment of the ratio of reduction is made by axially moving the lever 68 from what is called its zero position. The zero position of the lever 68 is that in which the length from 18 to the axis of the tool 17 is set at its minimum. The length from 16 to the axis of the tracer 15 is set 'at its maximum and in which the axes of the tool 17 of the tracer 15 and of the shaft 1 coincide. Then if the scale 25 (which for convenience will read in decimals of inches) has its Zero-line in alinement with the edge 101 of the sleeve 90 when the level' 68 is in the above-defined zero position any axial movement of the lever 68 for the purposes of adjusting the ratio of reduction will he in the sense from 16 to 18 and will be read off on the scale 25, and the perpendicular distance (which is mil for the Zero position above described) of the point of intersection of the axis of lever 68 with the vertical plane containing the axis of 1 will be increased by the amount which is called S. Let t equal the minium length from 18 to the axis of the tool 17. L equals the maximum length from 16 to the axis of the tracer 15, and when the machine stands set with the above lengths let the lever 68 -be at its zero, whence S equals 0 at this position-v1 a., the above length relationship is always coincident with the Zero position of the lever. Now, therefore, ratio of reduction equals also,

ratio of reduction equals Therefore H52@ L S P` If t equals 1 and L equals 15, S equals rrrrr Now let T equal the distance in the direction of the axis of the lever 68, to which a given point on the said axis must beset. fe have a triangle in which I sec. a.,

T I S sec. a; but as S I Effi! l -i- (l 15d P T-sec. n.. *P+(Z sec. a being a numerical constant of the machine; For example, 1f q- 45O then scc. t JQ or 1.414.

79 is a set-screw workin g through the sleeve IOO 69 to hold the lever 68 to itin .any adjusted position; but moving thek lever 68 through the sleeve 69 will rock the `levers 10 11. l Under those circumstances the set-screw 65 is to be unscrewed-as Well as the screw 79EL and ,the shaft 1 moved through its bearings 2 2 at the same time that the lever 68 is moved through thesleeve 69. After the adjustments of the lever 68 `and shaft 1 have been effected the tracerl5 and the tool 17 must both be moved along their respective levers and l11 to aline their axes with that ofthe said shaft-L To make such adjustments practicable,the tracer is mounted in atracer-block 57, adapted to.

slide in a slot 29 in the lever y1() and to be K locked to the latter ingthe adjusted position by any suitable means, such as locking-nuts 30 30, the tool 17 also being mounted in a toolblock 31, adapted to slide ina slot 32 in the lever l1 and to be locked to the latter in the adjusted position by locking-nuts 33 33. It-

is very probable that diiferent pattern-blocks 4 will be of different thicknesses, so that any one may after it has been mounted upon the respective end of the lshaftl hold the pattern v5 at a greater distance from the end of the said shaft than would another pattern-block hold its pattern. Hence it becomes necessary that both the tracer 15 'and the tool 17 should which intersects the axis of the said shaft,and

a linkage carrying the tracer and the tool and adapted to communicate the' motions ofv the former homologouslylto the latter, the said linkage consisting of a'lever longitudinally adjustable in the said sleeve, a lever of the first class having its fulcrum in the rear end p 'of the first-mentioned lever and carrying the tracer at one end of it in contact with the pattern, a lever of the second class having its fulcrum .on thegfront end of the first-mentioned lever and carrying the tool in contact with the work, and a linkconnecting the rear ends of the said levers of the lirst and second class.

2. The combination wtha single straight rotating shaft one end of which isl adapted to carry the pattern and the other end the work, of a sleeve pivoted on the base on a vertical axis which intersects the axis of the said shaft, and a linkage carrying the tracer and the tool and adapted to communicate the motions of the former homologously to the latter, the said linkage consisting of a lever longitudinally 'adjustable in the said sleeve, a

lever of theiirst class having its fulcrum in the rear end of the irst-mentioned lever and` carrying the tracer at one end of it in contact with the pattern, a lever of the second class having its fulcrum on thel front end of the duction between the pattern and the work.

3. The combination with a single straight rotating shaft one end of which is adapted to carry the pattern and the other end the work, of a sleeve pivoted on the base on a vertical axis which intersects the axis of the said shaft, and a linkage carrying'the tracer and the tool and adapted to communicate the motions of the former homologously to the latter, the said linkage consisting of a lever longitudinally adjustable in the said sleeve, a lever of the first class having its fulcrum in the rear end of the first-mentioned lever and carrying the tracer at one end of it in contact with the pattern, a lever of the second class having its fulcrum on the front end of the lirst-mentioned lever and carrying the tool in contact with the work, and a link connectingthe rear ends ofthe said leversof the rst and second class; means for'adjusting the position of the said linkage for ratio of reduction between the pattern and the work; and means for traversing the tracer and the `tool respectively over the pattern and the work between the center and the circumference thereof.

4. rIfhe combination with a single rotating shaft one end of which is adapted to carry the pattern and the other end the work, of 'a sleeve pivoted on the base on a vertical axis which intersects the axis of the said shaft, and a'linkage carrying the tracer and the tool and adapted to communicate the motions of the formerfhomologously to the latter', the said linkage consisting of a lever longitudi- IOO IIO

nally adjustable in the said sleeve, a lever of lthe first class hav-ing its fulcrum in the rear end of the first-mentioned lever and carrying 'the tracer at one end .ofit in contact with the pattern, a lever of thesecond class having its fulcrum on the front end of the first-mentioned lever and carrying the tool in contact with the work, and a link connecting-the rear ends Vof the said'levers of the -first and second` class; means for adjusting the position of the lsaid linkage for ratio ofl reduction `between the pattern and the work; and means for adjusting the tracer and the tool'upon the re-` tern and the other end thework, of a sleeve pivoted on the base of a vertical axis which intersects the axis of the saidv shaft, anda linkage carrying the tracer and the tool and adapted to communicate the motions of the former homologously to the latter; the said linkage consisting of a lever longitudinally adjustable in the said sleeve, a lever of the first class having its fulcrum in the rear end of the first-mentioned lever and carrying the tracer at one end of it in contact with the pattern, a lever of the second class having its fulcrum on the front end of the first-mentioned lever and carrying the tool in contact with the work, and a link connecting the rear ends of the said levers of the first and second class; means for adjusting the position of the said linkage for ratio of reduction betweenthe pattern and the work; means for adjusting the tracer and the tool upon the respective parts of the said linkage; and means for traversing the tracer and the tool respectively over the pattern and the work between the respective center and circumference thereof.

6. The combination of base; single shaft adapted to carry the pattern on one end of it and the work on the other end; bearings on the base for the said shaft; means for adjusting the position. of the shaft in its bearings; a sleeve pivoted on the base on la vertical axis which-intersects the axis of the said shaft; a linkage consisting of a lever longitudinally adjustable in the said sleeve, a lever of the first class having its fulcrum in the rear end of the first-mentioned lever and carrying the tracer at one end of it in contact with the pattern, a lever. of the second class having its fulcrum on the front end of the first-mentioned lever and carrying the tool in contact with the work, and a link connecting the rear ends of the saidlevers of the first and second class; means for adjusting the position of the said linkage for ratio of reduction between the pattern and the work; means for adjusting the tracer and the tool upon the respective parts of the said linkage; and means for traversing the tracer and the tool respectively over the pattern and the work between the respective center and circumference thereof.

7. The combination of base; single shaft adapted to carry the pattern on one end of it and the work on the other end; bearings on the base for the said shaft; means for adjusting the position of the shaft vin its bearings; asleeve pivoted on the base on a vertical axis which intersects the axis of the said shaft; a linkage consisting of a lever longitudinally adjustablein the said sleeve, a lever of the first class having its fulcrum in the rear end ofthe first-mentioned lever and carrying the tracer at one end of it in contact with the pattern, a lever of the second class having its fulcrum on the front end of the first-mentioned lever and carrying the tool in contact with the work, and a link connecting the rear ends of the said levers of the first and second class; and means consisting of a scale on the sliding lever of the linkage cooperating with the rear end of the sleeve as an index for indicating the positions of adjustment of the said linkage for different ratios of red uetion between the pattern and the work.

8. The combination of base;singlc shaft adapted to carry the pattern on one end of it and the work on the other end; bearings on the base for the said shaft; means for adjusting the position of the shaft in its bearings; a sleeve pivoted on the base on a vertical axis which intersects the axis of the said shaft; a linkage consisting of a lever longitudinally adjustable in the said sleeve, a lever of the .first class having its fulcrum in the rear end of the first-mentioned lever and carrying the tracer at one end of it in contact with the pattern, a lever of the second class having its fulcrum on the front end of the first-mentioned lever and carrying the tool in contact with the work, and a link connecting the rear ends of the said levers of the first and second class; means consisting of a scale on the sliding lever of the linkage cooperating with the rear end of the sleeve as an index for indicating the positions of adjustment of the said linkage for different ratios of reduction between the pattern and the work; and means for traversing the tracer and the tool respectively over the pattern and the work between the respective center and the circumference thereof, consisting of a rod adapted to slide in a here in the sliding lever of the linkage, a slide, a pivotal connection between the adjacent ends of the rod and slide, a guide for the slide, and a traversing-screw engaging with the said slide to traverse it to and fro in its guide.

9. rlhe combination of base; single shaft adapted to carry the pattern on one end of it and the work on the other; bearings in the base for the shaft; means for adjusting the position of the shaft in its hearings; a sleeve pivoted on the base on a vertical axis which intersects the axis of the said shaft; a linkage consisting of a lever longitudinally adjustable in the said sleeve, a lever of the first class having its fulcrum in the rear end of the firstmentioned lever and carrying the tracer at one end of it in contact with the pattern, a lever of the second class having its fulcrum on the front end of the first-mentioned level' and carrying the tool in contact with the work, and a link connecting the rear ends of the said levers of the first and second class; means consisting of a scale on the sliding lever of the linkage cooperating with the rear end of the sleeve as an index for indicating the positions of adjustment of the said linkage for different ratios of reductiony between the pattern and the work; means for traversing the tracer aud the tool respectively over the pattern and the work between the respective center and the circumference thereof consisting of a rod adapted to slide in a bore in the sliding lever of the linkage, a slide, a pivotal connection IOO between the adjacent ends of the rod and slide, ing device for holding the block in its adj usted a guide'for the slide, and a traversing-screw position. I0 engaging with the said slideto traverse it toV In witness whereoi:l I have hereunto set my and fro in its guide; and means for alining hand in the presence of two witnesses.

the tracer and the tool axially with the shaft MARK BARR. consisting of a slot in the respective lever of VV'tnesses:

the linkage,l a block adapted to slide therein CHAs. S. WooDRoFFE,

lengthwise of therespective lever and a lock- HORACE GRELLIER. 

